Yes, I do know its a 3 slot cooler, that's why I'd have to change my sound card to make room for them; thanks though . What I was mainly saying was I could possibly sell my GTX 480s and buy the two Galaxy GTX 580s for the same net price as buying JUST the AXPs themselves. Therefore AXPs + GTX 580s > AXPs + GTX 480s at the same price. But if I can't get that net price, I'll probably just go for the AXPs themselves and put them on my GTX 480s

I'm voting water. 480s under water perform almost identical to 580s under water, and it'd be around the same cost as going from 2 480s to 2 580s, guessing you'd get ~$220 each for the 480s as new can be had for under $300.

You'd only net about ~$250 per GTX 480 (considering an EVGA GTX 480 B-Stock runs about $280) so you would get about $500 total for both of them. Two (new) GTX 580's will run you roughly cost you $950 shipped if you go for the Galaxy models which are coincidently the cheapest. So a total upgrade cost for you to go from GTX 480's to GTX 580's would be ~$450. Not worth it IMO, go for watercooling or better air coolers.